* Branding: It's become synonymous with his persona and a key part of his image. It helps him stand out from the crowd and is instantly recognizable.
* Publicity: It's a conversation starter and a way to get attention. It's hard not to notice a giant clock hanging around someone's neck!
* Symbolism: Some believe it represents his constant pursuit of time and his desire to "make every second count" in his life.
While there might be other reasons, these are the most commonly cited. It's important to note that Flavor Flav himself hasn't explicitly stated the specific reasons behind wearing the clock.